[Android] How to convert a character string to resourceId

important point

--fragment will result in an error unless getActivity (). getPackageName () is used. --If you use Integer.parseInt (), you get a java.lang.NumberFormatException error.

`MainActivity.java`


//java.lang.I get a NumberFormatException error
String bookImage = "book_image";
int imageId = Integer.parseInt(bookImage);

How to convert a string to resourceId in Activity

`MainActivity.java`


String bookImage = "book_image";
int imageId = getResources().getIdentifier(
                    bookImage, "drawable", getPackageName());

-----------------------------
//Output result
bookImage : book_image
imageId   : 2131099756 (Some number)

How to convert a string to resourceId in Fragment

`MainFragment.java`


String bookImage = "book_image";
int imageId = getResources().getIdentifier(
                    bookImage, "drawable", getActivity().getPackageName());

-----------------------------
//Output result
bookImage : book_image
imageId   : 2131099756(Some number)

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